I think the reason would be that your body cannot handle the change so sudden or what another person said, the antioxidants in them. I don't know...but that happened to me also. My mom bought this big bottle of pomegranate juice to take a shot of every day. It's really strong and supposed to be good for you, well after the first 3 days of taking it, after i would take it i would get really nauseas. I would feel like throwing up and still feel it there in my throat. So i had to stop taking it, i guess it was just too strong for me or something. But im like you, im horrible at taking care of myself. I don't take vitamins, and i really have tried to but i can't stick to it. I'm supposed to take calcium pills cause i have scoliosis and anemia but I forget to take them everyday, i can't be on birth control cause of that, ill forget to take them, medication, etc. I always forget so they're not affective
I need to be more responsible with that lol My dad even gets frustrated and got me calcium chews, and powders but i just leave them there after using them a couple times